Antenna structures having reactance at free end
AssigneeBeam Guidance Inc.
InventorGeorge E. J. Goubau
Life of this patent
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Abstract
The invention relates to an antenna structure comprising a number of parallel conductors having dimensions and spacings which are small against operating wavelength, and positioned perpendicular to a conducting ground plane; the upper ends of the conductors are terminated by metal plates acting as capacitors against the ground plane, and interconnected by inductive elements, the lower ends of some of said conductors are electrically connected to said ground plane, while another one of these conductors is connected to a power source to impress a voltage between the lower end of said other conductor and said ground plane.
Claims18
In an antenna structure, means serving as a ground plane, a number of elongated conductors having mutual spacings which are small against operating wave length, and positioned substantially perpendicular to said ground plane;
- some of said conductors at their lower ends being connected to said ground plane while at least one of said conductors is connected to the input terminal of the antenna structure, inductive elements, and separate conductive segments terminating each of said elongated conductors at its upper end, to act as top capacitors against said ground plane, and interconnected by said inductive elements.
In an antenna structure, two sets of elongated conductors, the conductors in each set having mutual spacings which are small against operating wave length, and positioned substantially parallel to each other;
- one set forming an image of the other set;
- some of the adjacent conductor ends of the different conductor sets being connected to each other, while at least one of the conductors in each conductor set is connected to an input terminal of the antenna structure;
- the conductors of each conductor set forming the feed lines for a balanced two-wire input line to the antenna structure, two sets of separate conductive segments terminating each set of said elongated conductors at their other ends to act as capacitors, and inductive elements interconnecting said capacitors, to provide a desired input impedance characteristic.
Dependencies are inferred from the claim text.